Viewing station module information 157Programming Operations GuideYou can enable or disable any port. Refer to “Disabling/enabling a port channel setting” on page160.Station module line deploymentThe MSC presents 32 physical ports for each bus number assigned to a station or analog stationmodule. The DIP switch settings on the module determine which ports support telephoneconnections. The first 16 ports are based on the B1 channel; the second 16 ports are based on theB2 channel. Therefore, if a single-density DSM 16 module is used, only the first 16 DNs areavailable for system telephones. Any module that was installed on a BCM version 2.5 or earliersystem is single density, which means it would support some of the first 16 ports, depending on thetype of module.On systems running BCM version 3.0 and newer software, if you install DSM 16+ or DSM32+modules, you can set them to be either single density or double density. An GASM installed on adouble density bus can populate all four offsets. If a DSM16+ or DSM32+ are set to doubledensity 32 ports are available, depending on the module and the dip switch settings. Example: ADSM16+ set to double density accesses either the first 16 ports or the second 16 ports, dependingon the offset setting. A DSM32+ set to double density accesses the first 16 ports on the lowerconnector and the second 16 ports on the upper connector.Partial Double Density systems (PDD), which is the default system setting for BCM version 3.0and newer software, retain a single-density identity for buses 06 and 07, to allow support forlegacy Companion installations which support two handsets for each B1/B2 port. Each port insingle density configurations are assigned a B1 and a B2 channel. If you set your system tofully-deployed double density (FDD), both bus 06 and 07 are configured as double density and areno longer available for applications that require both B1 and B2 ports.You can change your system density from PDD to FDD under the Configuration menu in the MSCprogramming. (Services, Diagnostics, MSC)Upgraded systems: BCM version 2.5 systems upgraded to BCM version 3.0 or newer systemshave a different DN deployment than newly-deployed BCM version 3.0 systems. In upgradedsystems, the first 16 DNs are assigned to DS30 02, the next 16 are assigned to DS30 03, and so on,down to DS30 07. Then the first 16 DNs following this list is assigned to the second 16 lines (B2)on DS30 02, and so on down the list again.New BCM version 3.0 and newer systems: The DN deployment in these systems is sequential.That is, the first 32 DN numbers are assigned to DS30 02, the second 32 DN numbers are assignedto DS30 03, and so on.DN numbering for each type of system is displayed in tables in “DN mapping for digitaltelephones” on page 367
